Designing luam tawm hauv Circuit Court board (PCB) yog txoj haujlwm niaj hnub rau feem ntau cov kws tsim hluav taws xob (EE). Txawm hais tias xyoo dhau los ntawm PCB tsim kev paub, tsim kom muaj txiaj ntsig zoo-tsav PCB tsim qauv tsis yooj yim. Muaj ntau ntau yam los txiav txim siab, thiab cov khoom siv phaj yog ib qho ntawm lawv. Cov ntaub ntawv yooj yim siv los ua PCBS yog qhov tseem ceeb heev. Ua ntej kev tsim khoom, cov khoom ntawm cov khoom siv hauv ntau yam yuav tsum tau txiav txim siab, xws li kev hloov pauv, kub tsis kam, dielectric tsis tu ncua, dielectric lub zog, lub zog tensile, adhesion thiab lwm yam. Kev ua tau zoo thiab kev sib koom ua ke ntawm lub rooj tsav xwm hauv Circuit Court yog nyob ntawm cov khoom siv. Kab lus no tshawb ntxiv cov ntaub ntawv PCB. Yog li nyob twj ywm kom paub ntau ntxiv.

Yam khoom siv twg hauv PCB tsim?

Nov yog cov npe ntawm cov ntaub ntawv tseem ceeb siv los ua cov laug cam. Cia wb mus saib nws.

Fr-4: FR luv rau hluav taws RETARDENT. Nws yog cov khoom siv PCB feem ntau siv rau txhua hom kev tsim khoom PCB. Fiberglass reinforced epoxy laminate FR-4 yog tsim los siv fiberglass woven daim ntaub thiab nplaim hluav taws kub nyhiab. Cov khoom siv no nrov vim tias nws muab cov rwb thaiv hluav taws xob zoo heev thiab muaj lub zog ua tau zoo. Cov khoom no muab lub zog tensile siab heev. Nws paub txog nws kev tsim khoom zoo thiab nqus dej noo.

Fr-5: Lub hauv paus yog ua los ntawm cov iav fiber ntau cov khoom siv ntxiv thiab epoxy resin binder. Qhov no yog qhov kev xaiv zoo rau kev tsim txheej txheem txheej txheej txheej ntau txheej. Nws ua tau zoo hauv cov hlau tsis muaj vuam thiab muaj cov cuab yeej zoo heev ntawm qhov kub thiab txias. Nws tau sau tseg rau nws qhov qis nqus dej, tshuaj tsis haum, cov khoom siv hluav taws xob zoo thiab lub zog zoo.

Fr-1 thiab FR-2: Nws tau tsim los ntawm cov ntawv thiab phenolic sib txuas thiab yog qhov zoo tshaj plaws rau ib txheej txheej txheej txheem txheej txheem. Ob qho khoom siv muaj cov khoom sib xws, tab sis FR2 muaj iav hloov pauv kub dua li FR1.

Cem-1: Cov khoom siv no yog koom nrog cov khoom sib xyaw epoxy (CEM). Cov txheej muaj epoxy hluavtaws cob, cov ntaub fiberglass thiab cov tub ntxhais uas tsis yog fiberglass. Cov khoom siv, siv nyob rau hauv ib leeg-ib sab Circuit Court board, yog pheej yig thiab nplaim hluav taws. Nws yog nto moo rau nws cov khoom siv hluav taws xob thiab hluav taws xob zoo tshaj plaws.

Cem-3: Zoo ib yam li CEM-1, qhov no yog lwm cov khoom sib xyaw epoxy. Nws muaj cov nplaim hluav taws tsis zoo thiab feem ntau yog siv rau ob tog sib tshooj ntawm cov laug cam. Nws tsis muaj zog dua li cov tshuab FR4, tab sis pheej yig dua FR4. Yog li, nws yog qhov kev xaiv zoo rau FR4.

Tooj liab: Tooj liab yog qhov kev xaiv thawj hauv kev tsim hluav taws xob ib leeg thiab ntau txheej txheej. Qhov no yog vim nws muab qib siab zog, muaj cua sov zoo thiab hluav taws xob ua hluav taws xob thiab tshuaj lom neeg tsawg.

Siab Tg: Siab Tg qhia txog iav hloov pauv kub. Cov khoom siv PCB no zoo tagnrho rau cov laug cam hauv cov ntawv thov. Tg cov ntaub ntawv muaj qhov kub thiab txias ntev thiab lub sij hawm ntev delamination durability.

Rogers: Feem ntau hu ua RF, cov khoom siv no tau paub txog nws qhov sib xws nrog FR4 laminates. Vim tias nws qhov dav dav ua kom zoo thiab tswj tau qhov tsis zoo, tsis muaj cov hlau lead hauv Circuit board tuaj yeem ua haujlwm tau yooj yim.

Aluminium: Cov khoom siv PCB yooj yim thiab yooj yim no tiv thaiv cov laug cam los ntawm kev ua kom sov. Nws tau xaiv feem ntau rau nws lub peev xwm los ua kom sov sai.

Halogen-free aluminium: Cov hlau no zoo tshaj plaws rau kev siv ib puag ncig zoo. Halogen-free aluminium tau txhim kho dielectric tas li thiab noo noo diffusivity.

Tau ntau xyoo, PCBS tau txais qhov muaj koob npe zoo thiab pom muaj ntau yam kev siv hauv kev lag luam uas xav tau cov khoom siv nyuaj. Yog li, xaiv cov khoom PCB raug yog qhov tseem ceeb heev, vim nws cuam tshuam tsis tsuas yog ua haujlwm thiab tus yam ntxwv, tab sis kuj suav tag nrho tus nqi ntawm pawg thawj coj saib. Xaiv cov ntaub ntawv raws li daim ntawv thov xav tau, ib puag ncig ib puag ncig, thiab lwm yam kev txwv los ntawm PCB.